In the case of odd \(n^R\) , on the other hand, it is
possible to set \(N_{\rm pf}=n\) , and \(l_k=1/2\) , by
applying the rational
approximation [1]} to \(H_f^R\) —see Sect. IIIB of Ref. [2]},
also for the definition of the numerical coefficients appearing in the RHMC approximation.
